Appendix W – Maintenance Check
Type
Motor kW
D (Drive end)
N (Fan end)
Grease quantity in
grams per bearing
NC 160 M1-2
11
6209
6209
20
NC 160 M2-2
15
6209
6209
20
NC 180 M-2
2-15
6211
6211
25
NC 200 L1-2
30
NU212
6212
25
NC 200 L2-2
37
NU212
6212
25
NC 225 M-2
45
NU312
6312
25
NC 250 M-2
55
NU313
6313
30
NC 280
75,0 / 90,0
NU314
6314 C3
35
NC 315
110/132/160
NU 316
6316
50
The electric motors of our compressors up to 9 kW (Niedermeier) and until 15 kW (Elektra) are
equipped with so called permanently lubricated or closed bearings. Calculated life time is
between 10 and 20.000 operating hours (OH). These type of bearings can be changed when
other major servicing and or maintenance work is carried out.
We can let you know the bearing types upon request.
Since January / February 2003 our motors (also the EFF types) from 11kW
and
larger are equipped with deep groove ball and cylinder roller bearings respectively. As
in the past these bearings are of the open type. They are filled with high temperature grease.
The motors have re-grease facilities on both ends.
These facilities make it much easier to re-grease the motor.
When re-greasing only
use high temperature grease (for minimum 175°C – Lithium based – SKF LGHQ3/1 or
equivalent).
Greasing of the motors should be done every 2000 hours and should be
organized together with the corresponding compressor service.
Please consider that high ambient temperatures, dusty and other detrimental
ambient conditions negatively influence the life-time of the bearings. In these cases
the regreasing time should be reduced.
Please see hereunder details of the motor bearings and the quantities of grease
required:
The quantity of grease mentioned should be introduced into the bearings by means of a grease
gun. If excessive grease is introduced it will emerge from an opening near to the grease inlet.
This outlet must be opened (small screw) prior to the commencement of and closed, after the
completion of the greasing procedure.
Maintenance -
motor bearings (motors from beginning of 2003)
